Application of presplitting blasting in high chamber excavation of an underground mine

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0036

Abstract

Abstract:

In response to increased ore dilution rate caused by blasting disturbance to adjacent fill bodies during the two-step room mining process in a certain underground copper mine that adopts the open stoping with subsequent filling method in the large-diameter deep-hole stage, experimental research on presplitting blasting technology in the excavation of large chambers was conducted. The presplitting blasting parameters were determined as follows: hole diameter of 100 mm, linear charge density of 1 kg/m, and enhanced charge density at the hole bottom and middle section up to 2 kg/m. The results indicate that presplitting blasting effectively reduces the damage to the fill bodies and rock mass, decreases the waste rock mixing rate, and improves ore recovery efficiency. On the basis of the existing blasthole layout, only one additional peripheral blasthole is needed to achieve the presplitting effect, providing a feasible approach to reduce the waste rock mixing rate and improve ore extraction efficiency in the two-step mining.

Key words: presplitting blasting, prospecting chamber, presplitting hole, charge weight, charge density

CLC Number:

X936

LEI Tao. Application of presplitting blasting in high chamber excavation of an underground mine[J]. China Safety Science Journal, 2025, 35(S2): 182-188.

Figures/Tables 13

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技术参数	拉槽孔+辅助孔	预裂孔
线装药密度/(kg·m^-1)	—	1.00
装药量/kg	456	81
崩矿量/t	127.69	287.30
总装药量/kg	537
总崩矿量/t	415
平均炸药单耗/(kg·t^-1)	1.29

器材名称	规格	数量
2^#岩石乳化炸药	Φ32 mm	270根
2^#岩石乳化炸药	Φ100 mm	152根
数码电子雷管	7 m	17发

序号	排号	孔号	孔深/m	装药长度/ m	药卷数量		装药量/kg	雷管/发	导爆索/m
序号	排号	孔号	孔深/m	装药长度/ m	Φ100 mm	Φ32 mm	装药量/kg	雷管/发	导爆索/m
1	1P	1	5.268	3.5	0	15	4.5	0	10
2		2	5.01	3.5	0	15	4.5	0	10
3		3	4.923	3.5	0	15	4.5	0	10
4		4	5.01	3.5	0	15	4.5	0	10
5		5	5.268	3.5	0	15	4.5	0	10
6	2P	1	5.189	3.5	0	15	4.5	0	10
7		2	4.891	3.6	8	0	24	1	10
8		3	4.82	3.6	8	0	24	1	10
9		4	4.891	3.6	8	0	24	1	10
10		5	5.189	3.5	0	15	4.5	0	10
11	3P	1	5.178	3.5	0	15	4.5	0	10
12		2	4.839	3.6	8	0	24	1	10
13		3	4.839	3.6	8	0	24	1	10
14		4	5.178	3.5	0	15	4.5	0	10
15	4P	1	5.236	3.5	0	15	4.5	0	10
16		2	4.891	3.6	8	0	24	1	10
17		3	4.82	4.2	14	0	42	1	0
18		4	4.82	4.2	14	0	42	1	0
19		5	4.891	3.6	8	0	24	1	10
20		6	5.236	3.5	0	15	4.5	0	10
21	5P	1	4.855	3.6	8	0	24	1	10
22		2	4.82	4.2	14	0	42	1	0
23		3	4.82	0	0	0	0	0	0
24		4	4.82	4.2	14	0	42	1	0
25		5	4.855	3.6	8	0	24	1	10
26	6P	1	5.362	3.5	0	15	4.5	0	10
27		2	4.994	3.6	8	0	24	1	10
28		3	4.924	3.6	8	0	24	1	10
29		4	4.994	3.6	8	0	24	1	10
30		5	5.362	3.5	0	15	4.5	0	10
31	7P	1	5.55	3.5	0	15	4.5	0	10
32		2	5.306	3.5	0	15	4.5	0	10
33		3	5.22	3.5	0	15	4.5	0	10
34		4	5.306	3.5	0	15	4.5	0	10
35		5	5.55	3.5	0	15	4.5	0	10
起爆预裂孔使用1发雷管								1	20
合计			177.125	123	152	270	537	17	320